: I would like to replace my tub and wondered if I am supposed to install the new greenboard over the lip of the tub or just up to it? I am going to install a fiberglass 3 piece surround as well. Thanks for the help.

Yes, the board should overlap the lip, but it should NOT go all the way down to the top of the tub. I used a piece of 1/4" lath as a spacer (removing it once board is secured). You should really look into using cement board (Durock or Wonderboard) or DenShield instead of greenboard. Both options do a much better job and are not much more expensive.